WO2018063071A1 - Priorisation de puissance de liaison montante pour tti courts - Google Patents

Priorisation de puissance de liaison montante pour tti courts Download PDF

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Publication number
WO2018063071A1
WO2018063071A1 PCT/SE2017/050947 SE2017050947W WO2018063071A1 WO 2018063071 A1 WO2018063071 A1 WO 2018063071A1 SE 2017050947 W SE2017050947 W SE 2017050947W WO 2018063071 A1 WO2018063071 A1 WO 2018063071A1
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WIPO (PCT)
Prior art keywords
transmissions
power
stti
scheduled
wireless device
Prior art date
Application number
PCT/SE2017/050947
Other languages
English (en)
Inventor
Laetitia Falconetti
Gustav Almquist
Daniel Larsson
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to EP17784035.2A priority Critical patent/EP3520502B1/fr
Priority to US16/337,811 priority patent/US10785727B2/en
Priority to CN201780059801.7A priority patent/CN109792692B/zh
Priority to RU2019113068A priority patent/RU2716500C1/ru
Publication of WO2018063071A1 publication Critical patent/WO2018063071A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels

Definitions

  • the present disclosure relates, in general, to wireless communications and, more particularly, uplink power prioritization for short transmission time interval.
  • Packet data latency is one of the performance metrics that vendors, operators and also end-users (via speed test applications) regularly measure. Latency measurements are done in all phases of a radio access network system's lifetime, for example when verifying a new software release or system component, when deploying a system and when the system is in commercial operation.
  • LTE Long Term Evolution
  • Packet data latency is important not only for the perceived responsiveness of the system; it is also a parameter that indirectly influences the throughput of the system.
  • HTTP Hyper Text Transfer Protocol
  • TCP Transmission Control Protocol
  • HTTP Archive http://httparchive.org/trends.php
  • the typical size of HTTP based transactions over the internet are in the range of a few 10s of Kbyte up to 1 Mbyte.
  • the TCP slow start period is a significant part of the total transport period of the packet stream.
  • the performance is latency limited. Hence, improved latency can rather easily be shown to improve the average throughput for these types of TCP based data transactions.
  • Radio resource efficiency could be positively impacted by latency reductions. For example, lower packet data latency could increase the number of transmissions possible within a certain delay bound. Hence, higher Block Error Rate (BLER) targets could be used for the data transmissions, freeing up radio resources and potentially improving the capacity of the system.
  • BLER Block Error Rate
  • One area to address when it comes to packet latency reductions is the reduction of transport time of data and control signaling, by addressing the length of a transmission time interval (TTI). In LTE Release 8, a TTI corresponds to one subframe of length 1 millisecond (ms).
  • One such 1 ms TTI is constructed by using 14 Orthogonal Frequency Division Multiplexing (OFDM) or Single Carrier-Frequency Division Multiple Access (SC- FDMA) symbols in the case of normal cyclic prefix (CP) and 12 OFDM or SC-FDMA symbols in the case of extended CP.
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC- FDMA Single Carrier-Frequency Division Multiple Access
  • the shorter TTIs can be decided to have any duration in time and comprise resources on a number of OFDM or SC-FDMA symbols within a 1 ms subframe.
  • the duration of the short TTI may be 0.5 ms (i.e. , seven OFDM or SC- FDMA symbols for the case with normal cyclic prefix).
  • the duration of the short TTI may be 2 symbols.
  • PUSCH Physical Uplink Shared Channel
  • P (i) j s me ma xi mum transmit power in linear scale;
  • ( i s me power of simultaneously transmitted Physical Uplink Control Channel (PUCCH) in linear scale, is equal to zero if no PUCCH is transmitted;
  • Radio Resource Control RRC
  • the power control for sPUSCH has not been defined yet, but is likely to be based on the power control of PUSCH. Similar equation and parameters as listed above can be used.
  • Power control for Physical Uplink Control Channel is defined in 3 GPP TS 36.213 as, for subframe i and serving cell c,
  • c is the downlink path loss estimate
  • PUCCH ⁇ F is a relation in dB between PUCCH format F and PUCCH format la; j s an a( jj us tment factor depending on the number of coded bits that is exactly specified in 3 GPP TS 36.213;
  • -T X D ( F ) depends on the number of antenna ports configured for PUCCH; and is the closed loop power control state and is updated using ⁇ PUCCH signalled in the DL assignment.
  • the power control for sPUCCH has not been defined yet, but is likely to be based on the power control of PUCCH. Similar equations and parameters as listed above can be used.
  • the UL power is distributed among the uplink physical channels according to a priority of the 1 ms UL TTIs.
  • the priority information for the 1 ms UL TTIs may not provide sufficient information for distributing UL power in some scenarios.
  • the priority of the UL TTIs does not provide information about how to distribute UL power for scenarios in which the parallel transmissions include one or more UL sTTIs.
  • An object of certain embodiments includes improving distribution of UL power for scenarios in which a wireless device has parallel transmission of two or more UL physical channels and does not have enough power for parallel transmission of all UL physical channels. Certain embodiments improve distribution of UL power by providing rules for prioritizing sTTI transmissions. As an example, certain embodiments prioritize sTTI transmissions over TTI transmissions. As another example, certain embodiments prioritize sTTI transmissions comprising control information over sTTI transmissions without control information.
  • a method for use in a wireless device.
  • the method comprises determining that the wireless device has scheduled parallel transmissions during a subframe.
  • the parallel transmissions are scheduled on two or more uplink, UL, physical channels, and the parallel transmissions comprise one or more short transmission time interval, sTTI, transmissions.
  • the method further comprises distributing UL power among the parallel transmissions.
  • the UL power is distributed according to at least one of the following prioritization rules: (1) sTTI transmissions comprising control information are prioritized over sTTI transmissions comprising data without any control information; and/or (2) transmissions with shorter transmission time intervals are prioritized over transmissions with longer transmission time intervals.
  • a wireless device comprises memory and processing circuitry.
  • the memory is operable to store instructions
  • the processing circuitry is operable to execute the instructions.
  • the wireless device is operable to determine that the wireless device has scheduled parallel transmissions during a subframe.
  • the parallel transmissions are scheduled on two or more uplink, UL, physical channels, and the parallel transmissions comprise one or more short transmission time interval, sTTI, transmissions.
  • the wireless device is further operable to distribute UL power among the parallel transmissions.
  • the UL power is distributed according to at least one of the following prioritization rules: (1) sTTI transmissions comprising control information are prioritized over sTTI transmissions comprising data without any control information; and/or (2) transmissions with shorter transmission time intervals are prioritized over transmissions with longer transmission time intervals.
  • a computer program product comprising a non- transitory computer readable medium.
  • the non-transitory computer readable medium stores computer readable program code.
  • the computer readable program code comprises program code for determining that the wireless device has scheduled parallel transmissions during a subframe.
  • the parallel transmissions are scheduled on two or more uplink, UL, physical channels, and the parallel transmissions comprise one or more short transmission time interval, sTTI, transmissions.
  • the computer readable program code further comprises program code for distributing UL power among the parallel transmissions.
  • the UL power is distributed according to at least one of the following prioritization rules: (1) sTTI transmissions comprising control information are prioritized over sTTI transmissions comprising data without any control information; and/or (2) transmissions with shorter transmission time intervals are prioritized over transmissions with longer transmission time intervals.
  • Certain embodiments of the above-described method, wireless device, and/or computer program product may include one or more of the following features:
  • the method/wireless device/computer program product determines that the wireless device has a limited UL power for the parallel transmissions scheduled during the subframe.
  • the prioritization rules for distributing UL power among the parallel transmissions comprise prioritizing the sTTI transmissions in the following order: (1) sTTI transmissions that use a control channel to transmit control information, (2) sTTI transmissions that use a data channel to transmit control information, and (3) sTTI transmissions that use the data channel to transmit data without any control information.
  • the method/wireless device/ computer program product uses a common factor to scale the UL power for the sTTI transmissions that use the data channel to transmit data (rather than control information) based on determining that the UL power is not sufficient for the parallel transmissions.
  • the parallel transmissions comprise one or more TTI transmissions, each having a duration of 1 ms (whereas each of the one or more sTTI transmissions has a duration of less than 1 ms).
  • the prioritization rules for distributing the UL power among the parallel transmissions prioritize the one or more sTTI transmissions over the one or more TTI transmissions.
  • the parallel transmissions comprise one or more TTI transmissions configured according to Long Term Evolution, LTE, Release 8.
  • the prioritization rules for distributing the UL power among the parallel transmissions prioritize the one or more sTTI transmissions over the one or more TTI transmissions, each sTTi transmission having a shorter duration than each TTI transmission.
  • distributing the UL power among the parallel transmissions comprises reserving a first amount of UL power for the one or more sTTI transmissions scheduled on the control channel.
  • the first amount of UL power is reserved upon determining that one or more of the sTTI transmissions are scheduled on a control channel.
  • a first amount of remaining UL power is calculated by deducting the reserved first amount of UL power from a total UL power allowed or available to the wireless device.
  • a second amount of UL power is reserved from the first amount of remaining UL power for the one or more sTTI transmissions scheduled on the data channel and including the control information. The second amount of power is reserved upon determining that one or more of the sTTI transmissions are scheduled on a data channel and include the control information.
  • a second amount of remaining UL power is calculated by deducting the reserved second amount of UL power from the calculated first amount of remaining UL power.
  • a third amount of UL power is reserved from the second amount of remaining UL power for the one or more sTTI transmissions scheduled on the data channel and not including the control information. The third amount of UL power is reserved upon determining that one or more of the sTTI transmissions are scheduled on the data channel and do not include the control information.
  • the method/wireless device/computer program product transmits the parallel transmissions according to the determined distribution of UL power.
  • the transmissions with the shorter transmission time intervals are scheduled on a different carrier than the transmissions with the longer transmission time intervals.
  • the prioritization rules for distributing UL power prioritize sTTI transmissions that include control information over sTTI transmissions that do not include control information, and prioritize TTI transmissions that include control information over TTI transmissions that do not include control information.
  • the prioritization rules for distributing UL power may prioritize transmissions in the following order: (1) sTTI transmissions that include control information, (2) sTTI transmissions that do not include control information, (3) TTI transmissions that include control information, (4) TTI transmissions that do not include control information.
  • the one or more sTTI transmissions are scheduled only at the beginning of the subframe.
  • distributing the UL power for the subframe may comprise distributing a first amount of UL power for the one or more sTTI transmissions, calculating a remaining UL power by deducting the first amount of UL power from a total UL power allowed or available to the wireless device, and distributing the remaining UL power for the TTI transmissions.
  • the first amount of UL power (the UL power for the one or more sTTI transmission) satisfies the UL power needed for the one or more sTTI transmissions.
  • distributing the UL power for the subframe comprises determining all of the UL transmissions that have been scheduled for the subframe as of a pre-determined time (tO).
  • the pre-determined time is based on an amount of time before the start of the subframe (tstait - ⁇ ).
  • a first amount of UL power is distributed for the sTTI transmissions.
  • the first amount of UL power satisfies the UL power needed for the one or more sTTI transmissions that have been scheduled for the subframe as of the predetermined time (tO) is distributed for the sTTI transmissions.
  • the remaining UL power is calculated by deducting the first amount of UL power from a total UL power allowed or available to the wireless device.
  • the remaining UL power is distributed for the TTI transmissions. In certain embodiments, less UL power is distributed to the TTI transmissions for a portion of the subframe during which the sTTI transmissions have been scheduled, and more UL power is distributed to the TTI for a portion of the subframe during which the sTTI transmissions have not been scheduled.
  • each of the one or more sTTI transmissions is scheduled in the middle of the subframe.
  • the length of the subframe is 1 ms.
  • the one or more sTTI transmissions comprise a first sTTI transmission and a second sTTI transmission.
  • the first and second sTTI transmissions each has a duration less than 1 millisecond, and the first sTTI has a shorter duration than the second sTTI.
  • the prioritization rule for distributing UL power prioritizes the shorter sTTI (first sTTI) over the longer sTTI (second sTTI).
  • Certain embodiments of the present disclosure may provide one or more technical advantages. For example, certain embodiments may advantageously enable a UE to distribute its power with the most appropriate priority in case the UE has not enough power for all UL physical channels.
  • Certain embodiments may prioritize UL power distribution to UL transmissions having an sTTI over UL transmissions having a TTI.
  • An advantage of prioritizing UL power distribution to sTTIs may be to ensure sufficient UL power is allocated to minimize delays for sTTIs (which are typically less delay-tolerant than TTIs).
  • Certain embodiments may prioritize UL power distribution to UL transmissions that include control information over UL transmissions that do not include control information.
  • An advantage of prioritizing UL power distribution to control information may be to ensure sufficient UL power is allocated to minimize delays for control information (which may be important for optimal control).
  • Other advantages may be readily apparent to one having skill in the art. Certain embodiments may have none, some, or all of the recited advantages. BRIEF DESCRIPTION OF THE DRAWINGS
  • FIGURE 1 is a schematic diagram of an exemplary wireless communications network, in accordance with certain embodiments.
  • FIGURE 2 illustrates an example of UL power level on 1 ms TTI carrier with potential parallel UL sTTI transmission in another carrier, in accordance with certain embodiments.
  • FIGURE 3 illustrates an example of how to consider potential parallel UL sTTI transmission when setting UL power for 1 ms UL TTI, in accordance with certain embodiments
  • FIGURE 4 illustrates a comparison of power level for 1 ms UL TTI when potential parallel UL sTTI transmissions are considered and when they are not considered, in accordance with certain embodiments;
  • FIGURE 5 is a flow diagram of a method in a user equipment, in accordance with certain embodiments.
  • FIGURE 6 is a flow diagram of a method in a user equipment, in accordance with certain embodiments.
  • FIGURE 7 is a block schematic of an exemplary wireless device, in accordance with certain embodiments;
  • FIGURE 8 is a block schematic of an exemplary network node, in accordance with certain embodiments.
  • FIGURE 9 is a block schematic of an exemplary radio network controller or core network node, in accordance with certain embodiments.
  • FIGURE 10 is a block schematic of an exemplary wireless device, in accordance with certain embodiments.
  • FIGURE 11 is a block schematic of an exemplary network node, in accordance with certain embodiments.
  • FIGURE 12 is a flow diagram of a method in a wireless device, in accordance with certain embodiments.
  • the UL power is distributed among the uplink physical channels according to priority.
  • UL power may be distributed according to the following priority: (1) PUCCH first; (2) PUSCH with UCI (UL control Information); (3) PUSCH without UCI; (4) PRACH; and (5) SRS.
  • Certain UEs can also support sTTI transmissions (an sTTI transmission has a duration less than 1 ms and is therefore shorter than a 1ms TTI transmission).
  • power control for physical channels on sTTI has not yet been defined.
  • a methods to support UL power prioritization among UL channels for sTTI are disclosed.
  • UL power is prioritized among sTTI UL channels and between sTTI and 1 ms TTI UL channels.
  • a method is disclosed to set the power for 1 ms UL TTI considering the sTTI scheduled for the overlapping subframe.
  • the various embodiments described herein may advantageously enable a UE to distribute its power with the most appropriate priority in case the UE has not enough power for all UL physical channels. Other advantages may be readily apparent to one having skill in the art. Certain embodiments may have none, some, or all of the recited advantages.
  • FIGURE 1 is a block diagram illustrating an embodiment of a network 100, in accordance with certain embodiments.
  • Network 100 includes one or more UE(s) 110 (which may be interchangeably referred to as wireless devices 110) and one or more network node(s) 115 (which may be interchangeably referred to as eNBs 115).
  • UEs 110 may communicate with network nodes 115 over a wireless interface.
  • a UE 110 may transmit wireless signals to one or more of network nodes 115, and/or receive wireless signals from one or more of network nodes 115.
  • the wireless signals may contain voice traffic, data traffic, control signals, and/or any other suitable information.
  • an area of wireless signal coverage associated with a network node 115 may be referred to as a cell 125.
  • UEs 110 may have device-to-device (D2D) capability. Thus, UEs 110 may be able to receive signals from and/or transmit signals directly to another UE.
  • D2D device-to-device
  • network nodes 115 may interface with a radio network controller.
  • the radio network controller may control network nodes 115 and may provide certain radio resource management functions, mobility management functions, and/or other suitable functions. In certain embodiments, the functions of the radio network controller may be included in network node 115.
  • the radio network controller may interface with a core network node. In certain embodiments, the radio network controller may interface with the core network node via an interconnecting network 120.
  • Interconnecting network 120 may refer to any interconnecting system capable of transmitting audio, video, signals, data, messages, or any combination of the preceding.
  • Interconnecting network 120 may include all or a portion of a public switched telephone network (PSTN), a public or private data network, a local area network (LAN), a metropolitan area network (MAN), a wide area network (WAN), a local, regional, or global communication or computer network such as the Internet, a wireline or wireless network, an enterprise intranet, or any other suitable communication link, including combinations thereof.
  • PSTN public switched telephone network
  • LAN local area network
  • MAN metropolitan area network
  • WAN wide area network
  • Internet local, regional, or global communication or computer network
  • wireline or wireless network such as the Internet
  • enterprise intranet an enterprise intranet, or any other suitable communication link, including combinations thereof.
  • the core network node may manage the establishment of communication sessions and various other functionalities for UEs 110.
  • UEs 110 may exchange certain signals with the core network node using the non-access stratum layer.
  • signals between UEs 110 and the core network node may be transparently passed through the radio access network.
  • network nodes 115 may interface with one or more network nodes over an internode interface, such as, for example, an X2 interface.
  • example embodiments of network 100 may include one or more wireless devices 110, and one or more different types of network nodes capable of communicating (directly or indirectly) with wireless devices 110.
  • UEs 110 described herein can be any type of wireless device capable of communicating with network nodes 115 or another UE over radio signals.
  • UE 110 may also be a radio communication device, target device, D2D UE, machine-type-communication UE or UE capable of machine to machine communication (M2M), low-cost and/or low-complexity UE, a sensor equipped with UE,
  • M2M machine to machine communication
  • UE 1 10 may operate under either normal coverage or enhanced coverage with respect to its serving cell.
  • the enhanced coverage may be interchangeably referred to as extended coverage.
  • UE 110 may also operate in a plurality of coverage levels (e.g., normal coverage, enhanced coverage level 1, enhanced coverage level 2, enhanced coverage level 3 and so on). In some cases, UE 110 may also operate in out-of-coverage scenarios.
  • radio network node or simply
  • network node is used. It can be any kind of network node, which may comprise a base station (BS), radio base station, Node B, base station (BS), multi-standard radio (MSR) radio node such as MSR BS, evolved Node B (eNB), network controller, radio network controller
  • BS base station
  • MSR multi-standard radio
  • eNB evolved Node B
  • network controller radio network controller
  • RNC base station controller
  • BSC base station controller
  • BSC base station controller
  • BSC relay node
  • BTS base transceiver station
  • AP access point
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • DAS distributed antenna system
  • MCE Multi-cell/multicast Coordination Entity
  • core network node e.g., MSC, MME, etc.
  • O&M Multi-cell/multicast Coordination Entity
  • OSS SON
  • positioning node e.g., E-SMLC
  • MDT or any other suitable network node.
  • network node and UE should be considered non-limiting and does in particular not imply a certain hierarchical relation between the two; in general "eNodeB” could be considered as device 1 and “UE” device 2, and these two devices communicate with each other over some radio channel.
  • Example embodiments of UE 110, network nodes 115, and other network nodes are described in more detail below with respect to FIGURES 7-11.
  • FIGURE 1 illustrates a particular arrangement of network 100
  • network 100 may include any suitable number of UEs 1 10 and network nodes 115, as well as any additional elements suitable to support communication between UEs or between a UE and another communication device (such as a landline telephone).
  • LTE Long Term Evolution
  • the embodiments may be implemented in any appropriate type of telecommunication system supporting any suitable communication standards (including 5G standards) and using any suitable components, and are applicable to any radio access technology (RAT) or multi-RAT systems in which a UE receives and/or transmits signals (e.g., data).
  • RAT radio access technology
  • multi-RAT multi-RAT
  • the various embodiments described herein may be applicable to LTE, LTE-Advanced, 5G, UMTS, HSPA, GSM, cdma2000, WCDMA, WiMax, UMB, WiFi, another suitable radio access technology, or any suitable combination of one or more radio access technologies.
  • LTE Long Term Evolution
  • 5G Fifth Generation
  • UMTS Fifth Generation
  • HSPA High Speed Packet Access
  • GSM Global System for Mobile communications
  • cdma2000 High Speed Downlink
  • WCDMA Wideband Code Division Multiple Access
  • WiMax Worldwide Interoperability for Microwave Access
  • the UL power is distributed among the uplink physical channels according to the following priority:
  • a method in a UE comprises the following actions:
  • the UE should first reserve power for sPUCCH if it has a sPUCCH transmission.
  • the power reserved for a potential sPUCCH transmission follows the power control equation.
  • An example is provided for PUCCH format l/la/lb/2/2a/2b/3:
  • PUCCH format 4/5 CH,c (» ' )) + A TF,c (» ' ) + ⁇ ':F PUCCH ⁇ F)+ g(i)
  • the remaining power is then computed by removing the power reserved for a potential sPUCCH from the total available or allowed Tx power of the UE.
  • power is then reserved for sPUSCH with UCI in case there is such a transmission in the same sTTI.
  • the power reserved for sPUSCH with UCI follows the power control equation where an example is provided as follows:
  • the remaining power is then computed by removing the power reserved for sPUSCH with UCI from the Tx power of the UE remaining after action 1.
  • the remaining power after action 2 is then dedicated to sPUSCH without UCI transmissions.
  • the power needed for sPUSCH without UCI transmissions follows the power control e uation where an example is provided as follows:
  • the power is scaled with the same factor for all sPUSCH without UCI transmissions so that the remaining power after action 2 is not exceeded.
  • a UE can have received UL grants for overlapping or parallel short TTI UL transmission and 1 ms TTI UL transmission. This may happen on the same carrier or, more likely, this may happen on different carriers. In the latter case, a 1 ms TTI UL transmission is scheduled for UE 0 on carrier 0 and a sTTI UL transmission is scheduled in the same subframe for the same UE on carrier 1. If UE 0 is not power limited, the power for 1 ms UL TTI and the power for UL sTTI is calculated following the example equations described above. One consideration is how the power should be distributed if the UE is power limited.
  • Short TTI are used for time-critical services that would benefit from lower latency compared to 1 ms TTI.
  • the general rule should thus be to prioritize sTTI over 1 ms TTI since that will to the furthest extent make sure that latency critical sTTI transmissions are carried out as soon as possible.
  • the UE should first calculate the power that is needed for the sTTI UL transmissions. Several UL sTTI transmissions can be conducted in parallel (e.g., sPUCCH and sPUSCH or sPUSCH with UCI and sPUSCH). The prioritization among those UL sTTI channels should follow the method described above with respect to power prioritization among UL physical channels of short TTI. After having distributed the power among sTTI channels, the UE calculates the remaining power.
  • the UE Given the remaining power after action 1, the UE should distribute the power among 1 ms UL TTI channels according to the specified prioritization rules for 1 ms UL TTI physical channels described above.
  • the procedure described just above works well if sTTI transmissions are scheduled only at the beginning of a subframe.
  • the 1ms UL TTI transmission on carrier 0 starts at exactly the same time as the UL sTTI transmission on carrier 1.
  • the UE which then has all information available before transmission starts, can compute the power for sTTI and for 1 ms TTI before starting the transmission and can avoid changing output power during the subframe. This is depicted in FIGURE 2 on subframe n.
  • FIGURE 2 illustrates an example of UL power level on 1 ms TTI carrier with potential parallel UL sTTI transmission in another carrier, in accordance with certain embodiments. Since the considered UE is power-limited, it can be seen that in subframe n-1 where there was only a 1 ms UL TTI transmission and no parallel UL sTTI transmission, the power level used for the 1 ms UL TTI transmission was higher than in subframe n that has parallel UL sTTI transmissions.
  • a method is disclosed that may advantageously enable the UE to avoid as much as possible large power adjustment in the middle of the subframe for 1 ms UL TTI in that case. Such an embodiment is described below with respect to FIGURES 3 and 4.
  • FIGURE 3 illustrates an example of how to consider potential parallel UL sTTI transmission when setting UL power for 1 ms UL TTI, in accordance with certain embodiments.
  • the UE should check all UL transmissions scheduled for the subframe n. This includes the 1 ms TTI UL transmissions and short TTI UL transmissions.
  • the UE sets the power for the 1 ms TTI transmissions considering all the short TTI UL transmissions that the UE is aware of at to.
  • the reduced power for the 1 ms UL TTI is used from the subframe start and not only when the sTTI are actually transmitted in the middle of the subframe as was the case in FIGURE 2 described above. Since the delay d between the UL grant for short TTI transmission and the actual UL sTTI transmission, not all sTTI transmissions occuring in the following subframe are known to the UE at time to.
  • the last UL sTTI transmission is not known to the UE at time to. So, this means that there can be a variation of the power used for the 1ms UL TTI during the subframe but it can be much smaller compared to not applying this embodiment.
  • FIGURE 4 illustrates a comparison of power level for 1 ms UL TTI when potential parallel UL sTTI transmissions are considered and when they are not considered, in accordance with certain embodiments.
  • FIGURE 4 compares the power level for 1ms TTI if the scheduled UL sTTI are considered for the overlapping subframe and when they are not considered. It can be seen from FIGURE 4 that with the additional embodiment, the power of the 1 ms UL TTI is set to a lower value from the subframe start due to the UE power limitation and the consideration of scheduled sTTI in the same subframe.
  • FIGURE 5 is a flow diagram of a method in a user equipment.
  • the method begins at action 504, where the UE determines that the UE has parallel transmissions scheduled on two or more UL physical channels, the parallel transmissions comprising sTTI transmissions.
  • the UE distributes UL power among the parallel transmissions scheduled on the two or more UL physical channels such that sTTI transmissions containing control information are prioritized over sTTI transmissions containing data.
  • FIGURE 6 is a flow diagram of a method in a user equipment.
  • the method begins at action 604, where the UE determines, before the start of a first subframe, an amount of power needed for one or more UL transmissions scheduled in the first subframe, the one or more UL transmissions scheduled in the first subframe comprising at least one of an UL transmission having a TTI of 1 ms and an UL transmission having a short TTI.
  • the UE sets a first power level for the UL transmission having the TTI of 1 ms based on the UL transmission having the short TTI scheduled in the first subframe.
  • the UE transmits the one or more UL transmissions having the TTI of 1 ms at the set first power level.
  • FIGURE 7 is a block schematic of an exemplary wireless device, in accordance with certain embodiments.
  • Wireless device 110 may refer to any type of wireless device communicating with a node and/or with another wireless device in a cellular or mobile communication system.
  • Examples of wireless device 110 include a mobile phone, a smart phone, a PDA (Personal Digital Assistant), a portable computer (e.g., laptop, tablet), a sensor, a modem, a machine-type-communication (MTC) device / machine-to -machine (M2M) device, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB dongles, a D2D capable device, or another device that can provide wireless communication.
  • MTC machine-type-communication
  • M2M machine-to -machine
  • LME laptop mounted equipment
  • USB dongles a D2D capable device, or another device that can provide wireless communication.
  • a wireless device 110 may also be referred to as UE, a station (STA), a device, or a terminal in some embodiments.
  • Wireless device 110 includes transceiver 710, processing circuitry 720, and memory 730.
  • transceiver 710 facilitates transmitting wireless signals to and receiving wireless signals from network node 115 (e.g., via antenna 740)
  • processing circuitry 720 executes instructions to provide some or all of the functionality described above as being provided by wireless device 110
  • memory 730 stores the instructions executed by processing circuitry 720.
  • Processing circuitry 720 may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of wireless device 110, such as the functions of wireless device 110 (e.g., UE) described in relation to FIGURES 1-6 and/or 12. For example, processing circuitry 720 may perform functions related to distributing UL power among parallel transmissions that include one or more sTTI transmissions. In some embodiments, processing circuitry 720 may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, one or more application specific integrated circuits (ASICs), one or more field programmable gate arrays (FPGAs) and/or other logic.
  • CPUs central processing units
  • microprocessors one or more applications
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • Memory 730 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc. and/or other instructions capable of being executed by a processor.
  • Examples of memory 730 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non-transitory computer-readable and/or computer-executable memory devices that store information, data, and/or instructions that may be used by processing circuitry 720.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • mass storage media for example, a hard disk
  • removable storage media for example, a Compact Disk (CD) or a Digital Video Disk (DVD)
  • CD Compact Disk
  • DVD Digital Video Disk
  • wireless device 110 may include additional components beyond those shown in FIGURE 7 that may be responsible for providing certain aspects of the wireless device's functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the solution described above).
  • wireless device 110 may include input devices and circuits, output devices, and one or more synchronization units or circuits, which may be part of the processing circuitry 720.
  • Input devices include mechanisms for entry of data into wireless device 110.
  • input devices may include input mechanisms, such as a microphone, input elements, a display, etc.
  • Output devices may include mechanisms for outputting data in audio, video and/or hard copy format.
  • output devices may include a speaker, a display, etc.
  • FIGURE 8 is a block schematic of an exemplary network node, in accordance with certain embodiments.
  • Network node 115 may be any type of radio network node or any network node that communicates with a UE and/or with another network node.
  • Examples of network node 115 include an eNodeB, a node B, a base station, a wireless access point (e.g., a Wi-Fi access point), a low power node, a base transceiver station (BTS), relay, donor node controlling relay, transmission points, transmission nodes, remote RF unit (RRU), remote radio head (RRH), multi-standard radio (MSR) radio node such as MSR BS, nodes in distributed antenna system (DAS), O&M, OSS, SON, positioning node (e.g., E-SMLC), MDT, or any other suitable network node.
  • MSR multi-standard radio
  • Network nodes 115 may be deployed throughout network 100 as a homogenous deployment, heterogeneous deployment, or mixed deployment.
  • a homogeneous deployment may generally describe a deployment made up of the same (or similar) type of network nodes 115 and/or similar coverage and cell sizes and inter-site distances.
  • a heterogeneous deployment may generally describe deployments using a variety of types of network nodes 115 having different cell sizes, transmit powers, capacities, and inter-site distances.
  • a heterogeneous deployment may include a plurality of low-power nodes placed throughout a macro-cell layout.
  • Mixed deployments may include a mix of homogenous portions and heterogeneous portions.
  • Network node 115 may include one or more of transceiver 810, processing circuitry 820, memory 830, and network interface 840.
  • transceiver 810 facilitates transmitting wireless signals to and receiving wireless signals from wireless device 110 (e.g., via antenna 950)
  • processing circuitry 820 executes instructions to provide some or all of the functionality described above as being provided by a network node 115
  • memory 830 stores the instructions executed by processing circuitry 820
  • network interface 840 communicates signals to backend network components, such as a gateway, switch, router, Internet, Public Switched Telephone Network (PSTN), core network nodes or radio network controllers 130, etc.
  • PSTN Public Switched Telephone Network
  • Processing circuitry 820 may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of network node 115, such as those described above in relation to FIGURES 1-6 above.
  • processing circuitry 820 may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, and/or other logic.
  • Memory 830 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc. and/or other instructions capable of being executed by a processor.
  • Examples of memory 830 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non-transitory computer-readable and/or computer-executable memory devices that store information.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • mass storage media for example, a hard disk
  • removable storage media for example, a Compact Disk (CD) or a Digital Video Disk (DVD)
  • CD Compact Disk
  • DVD Digital Video Disk
  • network interface 840 is communicatively coupled to processing circuitry 820 and may refer to any suitable device operable to receive input for network node 115, send output from network node 115, perform suitable processing of the input or output or both, communicate to other devices, or any combination of the preceding.
  • Network interface 840 may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network.
  • network node 115 may include additional components beyond those shown in FIGURE 8 that may be responsible for providing certain aspects of the radio network node's functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the solutions described above).
  • the various different types of network nodes may include components having the same physical hardware but configured (e.g., via programming) to support different radio access technologies, or may represent partly or entirely different physical components.
  • FIGURE 9 is a block schematic of an exemplary radio network controller or core network node 130, in accordance with certain embodiments.
  • network nodes can include a mobile switching center (MSC), a serving GPRS support node (SGSN), a mobility management entity (MME), a radio network controller (RNC), a base station controller (BSC), and so on.
  • the radio network controller or core network node 130 includes processing circuitry 920, memory 930, and network interface 940.
  • processing circuitry 920 executes instructions to provide some or all of the functionality described above as being provided by the network node
  • memory 930 stores the instructions executed by processing circuitry 920
  • network interface 940 communicates signals to any suitable node, such as a gateway, switch, router, Internet, Public Switched Telephone Network (PSTN), network nodes 115, radio network controllers or core network nodes 130, etc.
  • PSTN Public Switched Telephone Network
  • Processing circuitry 920 may include any suitable combination of hardware and software implemented in one or more modules to execute instructions and manipulate data to perform some or all of the described functions of the radio network controller or core network node 130.
  • processing circuitry 920 may include, for example, one or more computers, one or more central processing units (CPUs), one or more microprocessors, one or more applications, and/or other logic.
  • Memory 930 is generally operable to store instructions, such as a computer program, software, an application including one or more of logic, rules, algorithms, code, tables, etc. and/or other instructions capable of being executed by a processor.
  • Examples of memory 930 include computer memory (for example, Random Access Memory (RAM) or Read Only Memory (ROM)), mass storage media (for example, a hard disk), removable storage media (for example, a Compact Disk (CD) or a Digital Video Disk (DVD)), and/or or any other volatile or non-volatile, non-transitory computer-readable and/or computer-executable memory devices that store information.
  • RAM Random Access Memory
  • ROM Read Only Memory
  • mass storage media for example, a hard disk
  • removable storage media for example, a Compact Disk (CD) or a Digital Video Disk (DVD)
  • CD Compact Disk
  • DVD Digital Video Disk
  • network interface 940 is communicatively coupled to processing circuitry 920 and may refer to any suitable device operable to receive input for the network node, send output from the network node, perform suitable processing of the input or output or both, communicate to other devices, or any combination of the preceding.
  • Network interface 940 may include appropriate hardware (e.g., port, modem, network interface card, etc.) and software, including protocol conversion and data processing capabilities, to communicate through a network.
  • network node may include additional components beyond those shown in FIGURE 9 that may be responsible for providing certain aspects of the network node's functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the solution described above).
  • FIGURE 10 is a block schematic of an exemplary wireless device, in accordance with certain embodiments.
  • Wireless device 110 may include one or more modules.
  • wireless device 110 may include a determining module 1010, a communication module 1020, a receiving module 1030, an input module 1040, a display module 1050, and any other suitable modules.
  • Wireless device 110 may perform the methods for uplink power prioritization for short TTI described with respect to FIGURES 1 -6 and/or 12.
  • Determining module 1010 may perform the processing functions of wireless device 1 10. For example, determining module 1010 may determine that the UE has parallel transmissions scheduled on two or more UL physical channels, the parallel transmissions comprising sTTI transmissions.
  • determining module 1010 may distribute UL power among the parallel transmissions scheduled on the two or more UL physical channels such that sTTI transmissions containing control information are prioritized over sTTI transmissions containing data.
  • determining module 1010 may determine, before the start of a first subframe, an amount of power needed for one or more UL transmissions scheduled in the first subframe, the one or more UL transmissions scheduled in the first subframe comprising at least one of an UL transmission having a TTI of 1 ms and an UL transmission having a short TTI.
  • determining module 1010 may set a first power level for the UL transmission having the TTI of 1 ms based on the UL transmission having the short TTI scheduled in the first subframe.
  • Determining module 1010 may include or be included in one or more processors, such as processing circuitry 720 described above in relation to FIGURE 7.
  • Determining module 1010 may include analog and/or digital circuitry configured to perform any of the functions of determining module 1010 and/or processing circuitry 720 described above. The functions of determining module 1010 described above may, in certain embodiments, be performed in one or more distinct modules.
  • Communication module 1020 may perform the transmission functions of wireless device 1 10. As one example, communication module 1020 may transmit the one or more UL transmissions having the TTI of 1 ms at the set first power level. Communication module 1020 may transmit messages to one or more of network nodes 1 15 of network 100. Communication module 1020 may include a transmitter and/or a transceiver, such as transceiver 710 described above in relation to FIGURE 7. Communication module 1020 may include circuitry configured to wirelessly transmit messages and/or signals. In particular embodiments, communication module 1020 may receive messages and/or signals for transmission from determining module 1010. In certain embodiments, the functions of communication module 1020 described above may be performed in one or more distinct modules.
  • Receiving module 1030 may perform the receiving functions of wireless device 1 10.
  • Receiving module 1030 may include a receiver and/or a transceiver, such as transceiver 710 described above in relation to FIGURE 7.
  • Receiving module 1030 may include circuitry configured to wirelessly receive messages and/or signals. In particular embodiments, receiving module 1030 may communicate received messages and/or signals to determining module 1010.
  • Input module 1040 may receive user input intended for wireless device 1 10.
  • the input module may receive key presses, button presses, touches, swipes, audio signals, video signals, and/or any other appropriate signals.
  • the input module may include one or more keys, buttons, levers, switches, touchscreens, microphones, and/or cameras.
  • the input module may communicate received signals to determining module 1010.
  • Display module 1050 may present signals on a display of wireless device 1 10.
  • Display module 1050 may include the display and/or any appropriate circuitry and hardware configured to present signals on the display.
  • Display module 1050 may receive signals to present on the display from determining module 1010.
  • Determining module 1010, communication module 1020, receiving module 1030, input module 1040, and display module 1050 may include any suitable configuration of hardware and/or software.
  • Wireless device 110 may include additional modules beyond those shown in FIGURE 10 that may be responsible for providing any suitable functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the various solutions described herein).
  • FIGURE 11 is a block schematic of an exemplary network node 1 15, in accordance with certain embodiments.
  • Network node 1 15 may include one or more modules.
  • network node 115 may include determining module 1 110, communication module 1 120, receiving module 1 130, and any other suitable modules.
  • one or more of determining module 1 110, communication module 1120, receiving module 1 130, or any other suitable module may be implemented using one or more processors, such as processing circuitry 820 described above in relation to FIGURE 8.
  • the functions of two or more of the various modules may be combined into a single module.
  • Network node 1 15 may perform the methods for effective MIB acquisition for MTC devices described above with respect to FIGURES 1 -6.
  • Determining module 1 110 may perform the processing functions of network node 1 15. Determining module 1 110 may include or be included in one or more processors, such as processing circuitry 820 described above in relation to FIGURE 8. Determining module 11 10 may include analog and/or digital circuitry configured to perform any of the functions of determining module 11 10 and/or processing circuitry 820 described above. The functions of determining module 1110 may, in certain embodiments, be performed in one or more distinct modules. For example, in certain embodiments some of the functionality of determining module 1110 may be performed by an allocation module.
  • Communication module 1120 may perform the transmission functions of network node 115. Communication module 1120 may transmit messages to one or more of wireless devices 110. Communication module 1120 may include a transmitter and/or a transceiver, such as transceiver 810 described above in relation to FIGURE 8. Communication module 1120 may include circuitry configured to wirelessly transmit messages and/or signals. In particular embodiments, communication module 1120 may receive messages and/or signals for transmission from determining module 1110 or any other module.
  • Receiving module 1130 may perform the receiving functions of network node 115. Receiving module 1130 may receive any suitable information from a wireless device. Receiving module 1130 may include a receiver and/or a transceiver, such as transceiver 810 described above in relation to FIGURE 8. Receiving module 1130 may include circuitry configured to wirelessly receive messages and/or signals. In particular embodiments, receiving module 1130 may communicate received messages and/or signals to determining module 1110 or any other suitable module.
  • Determining module 1110, communication module 1120, and receiving module 1130 may include any suitable configuration of hardware and/or software.
  • Network node 115 may include additional modules beyond those shown in FIGURE 11 that may be responsible for providing any suitable functionality, including any of the functionality described above and/or any additional functionality (including any functionality necessary to support the various solutions described herein).
  • FIGURE 12 is a flow diagram of a method for use in a wireless device 110, in accordance with certain embodiments.
  • the method determines that the wireless device 110 has scheduled parallel transmissions during a subframe (such as a 1 ms subframe described in LTE Release 8).
  • the parallel transmissions are scheduled on two or more uplink, UL, physical channels, and the parallel transmissions comprise one or more sTTI transmissions.
  • FIGURES 2, 3, and 4 illustrate examples in which the wireless device 110 has scheduled parallel transmissions on a first UL physical channel (e.g., the channel on carrier 0) and a second UL physical channel (e.g., the channel on carrier 1), and the parallel transmissions in subframe (n) include sTTI transmissions.
  • the embodiments in FIGURES 2- 4 show transmissions with the shorter transmission time intervals scheduled on a different carrier (carrier 1) than the transmissions with the longer transmission time intervals (carrier 0).
  • the method determines whether the wireless device 1 10 has a limited amount of UL power for the parallel transmissions scheduled during the subframe. In response to determining that wireless device 110 is not power-limited during the subframe, the method may perform UL power allocation without having to prioritize the allocation of UL power among the parallel transmissions. Alternatively, in response to determining that wireless device 110 is power-limited during the subframe, the method proceeds to action 1212 to distribute UL power according to prioritization rules for parallel transmission scenarios that include sTTI transmissions.
  • the method distributes UL power among the parallel transmissions.
  • the UL power is distributed according to one or more prioritization rules.
  • one of the prioritization rules may prioritize sTTI transmissions comprising control information over sTTI transmissions comprising data without any control information. Examples of methods that prioritize sTTI transmissions comprising control information over sTTI transmissions comprising data without any control information are discussed above with respect to power prioritization among UL physical channels of short TTI and FIGURE 5.
  • the prioritization rules for distributing UL power among the parallel transmissions comprise prioritizing the sTTI transmissions in the following order: (1) sTTI transmissions that use a control channel to transmit control information (such as sPUCCH), (2) sTTI transmissions that use a data channel to transmit control information (such as sPUSCH with UCI), and (3) sTTI transmissions that use the data channel to transmit data without any control information (such as sPUSCH without UCI).
  • one of the prioritization rules may prioritize transmissions with shorter transmission time intervals over transmissions with longer transmission time intervals. Examples of methods that prioritize transmissions with shorter transmission time intervals over transmissions with longer transmission time intervals are discussed above with respect to power prioritization between UL physical channels of short TTI and 1ms TTI and FIGURE 6, and certain examples can be summarized as follows:
  • the parallel transmissions comprise both TTI and sTTI transmissions.
  • Each TTI transmission has a duration of 1 ms, and each sTTI transmission has a duration of less than 1 ms.
  • the prioritization rules for distributing the UL power among the parallel transmissions prioritize the sTTI transmission(s) over the TTI transmission(s).
  • each TTI transmission can be configured according to Long Term Evolution, LTE, Release 8 (e.g., 14 symbols in the case of normal CP or 12 symbols in the case of extended CP), each sTTi transmission can have a shorter duration than each TTI transmission (e.g., 2 symbols, 7 symbols, or other suitable value less than TTI), and the prioritization rules for distributing the UL power among the parallel transmissions prioritize the one or more sTTI transmissions over the one or more TTI transmissions.
  • LTE Long Term Evolution
  • Release 8 e.g., 14 symbols in the case of normal CP or 12 symbols in the case of extended CP
  • each sTTi transmission can have a shorter duration than each TTI transmission (e.g., 2 symbols, 7 symbols, or other suitable value less than TTI)
  • the prioritization rules for distributing the UL power among the parallel transmissions prioritize the one or more sTTI transmissions over the one or more TTI transmissions.
  • the parallel transmissions comprise sTTI transmissions having different durations, such as a first sTTI transmission comprising 2 symbols and a second sTTI transmission comprising 7 symbols.
  • the first sTTI has a shorter duration than the second sTTI.
  • the prioritization rule for distributing UL power prioritizes the shorter sTTI (first sTTI having 2 symbols) over the longer sTTI (second sTTI having 7 symbols).
  • the prioritization rules can combine rules that prioritize distribution of UL power based on content of the transmission (e.g., prioritizing transmissions with control information over transmissions without control information) with rules that prioritize distribution of UL power based on duration of the transmission (e.g., prioritizing shorter transmissions over longer transmissions).
  • the prioritization rules for distributing UL power may prioritize transmissions in the following order: (1) sTTI transmissions that include control information, (2) sTTI transmissions that do not include control information, (3) TTI transmissions that include control information, (4) TTI transmissions that do not include control information.
  • the method transmits the parallel transmissions according to the distribution of UL power determined in action 1212. The method then ends.
  • the prioritization rules for distributing UL power discussed with respect to FIGURE 12 can calculate the UL power in any suitable manner. For example, as discussed above, one of the prioritization rules prioritizes transmissions in the following order: (1) sTTI transmissions that use a control channel to transmit control information (such as sPUCCH), (2) sTTI transmissions that use a data channel to transmit control information (such as sPUSCH with UCI), and (3) sTTI transmissions that use the data channel to transmit data without any control information (such as sPUSCH without UCI).
  • calculating the UL power based on this rule may comprise the following actions: • Reserve a first amount of UL power for the one or more sTTI transmissions scheduled on the control channel.
  • certain embodiments use a common factor to scale the UL power for the sTTI transmissions that use the data channel to transmit data (such as the sPUSCH without UCI) based on determining that the UL power is not sufficient for the parallel transmissions.
  • one of the prioritization rules discussed above prioritizes sTTI transmissions over TTI transmissions.
  • calculating the UL power based on this rule may comprise determining that the one or more sTTI transmissions are scheduled only at the beginning of the subframe.
  • distributing the UL power for the subframe may comprise distributing a first amount of UL power for the one or more sTTI transmissions, calculating a remaining UL power by deducting the first amount of UL power from a total UL power allowed or available to the wireless device, and distributing the remaining UL power for the TTI transmissions.
  • the first amount of UL power (the UL power for the one or more sTTI transmission) satisfies the UL power needed for the one or more sTTI transmissions.
  • FIGURE 2 illustrates an example of distributing UL power to sTTI transmissions when the sTTI subframes are scheduled only at the beginning of the subframe (see subframe n of FIGURE 2).
  • each of the one or more sTTI transmissions is scheduled in the middle of the subframe.
  • distributing the UL power for the subframe comprises determining all of the UL transmissions that have been scheduled for the subframe as of a pre-determined time (tO).
  • the pre-determined time is based on an amount of time before the start of the subframe (tstait - ⁇ ).
  • a first amount of UL power is distributed for the sTTI transmissions.
  • the first amount of UL power satisfies the UL power needed for the one or more sTTI transmissions that have been scheduled for the subframe as of the pre-determined time (tO) is distributed for the sTTI transmissions.
  • the remaining UL power is calculated by deducting the first amount of UL power from a total UL power allowed or available to the wireless device.
  • the remaining UL power is distributed for the TTI transmissions.
  • the UL power available for the TTI transmissions can be re-distributed during transmission of the sTTI(s) that did not get scheduled until after the pre-determined time (tO).
  • FIGURE 4 An example is shown in FIGURE 4, scenario B, wherein during the time that the fourth sTTI is transmitted on carrier 1, the UL power for the TTI on carrier 0 is reduced (in scenario B, UL power calculation for 1 ms TTI considers future scheduled sTTI).
  • less UL power is distributed to the TTI transmissions for a portion of the subframe during which the sTTI transmissions have been scheduled, and more UL power is distributed to the TTI for a portion of the subframe during which the sTTI transmissions have not been scheduled. Examples are shown in FIGURE 2 (carrier 0, subframe n+1) and FIGURE 4 (carrier 0, subframe n).
  • a method in a user equipment comprises determining that the UE has parallel transmissions scheduled on two or more uplink (UL) physical channels, the parallel transmissions comprising short transmission time interval (sTTI) transmissions.
  • the method comprises distributing UL power among the parallel transmissions scheduled on the two or more UL physical channels such that sTTI transmissions containing control information are prioritized over sTTI transmissions containing data.
  • UL uplink
  • sTTI short transmission time interval
  • the method may comprise determining that the UE has limited UL power for the parallel transmissions scheduled on the two or more UL physical channels; • distributing UL power among the parallel transmissions scheduled on the two or more UL physical channels such that sTTI transmissions containing control information are prioritized over sTTI transmissions containing data may comprise:
  • determining whether the UE has one or more UL transmissions scheduled on a data channel that include UL control information o upon determining that the UE has one or more UL transmissions scheduled on a data channel that include UL control information, reserving a second amount of UL power from the first amount of remaining UL power for the one or more UL transmissions scheduled on the data channel that include UL control information;
  • the method may comprise: o determining that the UL power as distributed is not sufficient for the parallel transmissions scheduled on the two or more UL physical channels;
  • the parallel transmissions may further comprise one or more 1 ms TTI UL transmissions, and the method may comprise:
  • a user equipment comprises one or more processors.
  • the one or more processors are configured to determine that the UE has parallel transmissions scheduled on two or more uplink (UL) physical channels, the parallel transmissions comprising short transmission time interval (sTTI) transmissions.
  • the one or more processors are configured to distribute UL power among the parallel transmissions scheduled on the two or more UL physical channels such that sTTI transmissions containing control information are prioritized over sTTI transmissions containing data.
  • a method in a user equipment comprises determining, before the start of a first subframe, an amount of power needed for one or more uplink (UL) transmissions scheduled in the first subframe, the one or more UL transmissions scheduled in the first subframe comprising at least one of an UL transmission having a transmission time interval (TTI) of 1 ms and an UL transmission having a short TTI.
  • the method comprises setting a first power level for the UL transmission having the TTI of 1 ms based on the UL transmission having the short TTI scheduled in the first subframe.
  • the method comprises transmitting the one or more UL transmissions having the TTI of 1 ms at the set first power level.
  • the method may comprise determining all UL transmissions scheduled in the first subframe; and
  • a user equipment comprises one or more processors.
  • the one or more processors are configured to determine, before the start of a first subframe, an amount of power needed for one or more uplink (UL) transmissions scheduled in the first subframe, the one or more UL transmissions scheduled in the first subframe comprising at least one of an UL transmission having a transmission time interval (TTI) of 1 ms and an UL transmission having a short TTI.
  • TTI transmission time interval
  • the one or more processors are configured to set a first power level for the UL transmission having the TTI of 1 ms based on the UL transmission having the short TTI scheduled in the first subframe.
  • the one or more processors are configured to transmit the one or more UL transmissions having the TTI of 1 ms at the set first power level.
  • Certain embodiments of the present disclosure may provide one or more technical advantages. For example, certain embodiments may advantageously enable a UE to distribute its power with the most appropriate priority in case the UE has not enough power for all UL physical channels. Other advantages may be readily apparent to one having skill in the art. Certain embodiments may have none, some, or all of the recited advantages.
  • SC-FDMA Single Carrier-Frequency Division Multiple Access sPDCCH Short Physical Downlink Control Channel sPDSCH Short Physical Downlink Shared Channel sPUSCH Short Physical Uplink Shared Channel

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Abstract

Certains modes de réalisation concernent un procédé destiné à être utilisé dans un dispositif sans fil. Le procédé consiste à distribuer une puissance de liaison montante parmi des transmissions parallèles que le dispositif sans fil a planifiées pendant une sous-trame sur deux canaux physiques de liaison montante ou plus. Les transmissions parallèles comprennent une ou plusieurs transmissions à intervalles de temps de transmission courts (sTTI, "short transmission time interval"), et la puissance de liaison montante est distribuée selon au moins une règle de priorisation. Selon l'une des règles de priorisation, des transmissions sTTI comprenant des informations de commande sont classées par ordre de priorité sur des transmissions sTTI comprenant des données sans aucune information de commande. Selon une autre règle des règles de priorisation, des transmissions avec des intervalles de temps de transmission plus courts sont priorisées par rapport à des transmissions avec des intervalles de temps de transmission plus longs.
PCT/SE2017/050947 2016-09-30 2017-09-28 Priorisation de puissance de liaison montante pour tti courts WO2018063071A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP17784035.2A EP3520502B1 (fr) 2016-09-30 2017-09-28 Priorisation de puissance de liaison montante pour tti courts
US16/337,811 US10785727B2 (en) 2016-09-30 2017-09-28 Uplink power prioritization for short TTI
CN201780059801.7A CN109792692B (zh) 2016-09-30 2017-09-28 针对短tti的上行链路功率优先化
RU2019113068A RU2716500C1 (ru) 2016-09-30 2017-09-28 Способ расстановки приоритетов мощности восходящей линии для коротких интервалов времени передачи

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US201662402370P 2016-09-30 2016-09-30
US62/402,370 2016-09-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3570599A4 (fr) * 2017-01-12 2020-08-26 Ntt Docomo, Inc. Terminal utilisateur et procédé de communication radio

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10531453B2 (en) 2017-02-06 2020-01-07 Qualcomm Incorporated Resource management for low latency wireless communications
WO2019000279A1 (fr) * 2017-06-28 2019-01-03 华为技术有限公司 Procédé et appareil de régulation de puissance de porteuse, support d'informations et produit-programme d'ordinateur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4127757B2 (ja) * 2001-08-21 2008-07-30 株式会社エヌ・ティ・ティ・ドコモ 無線通信システム、通信端末装置、及びバースト信号送信方法
UA94059C2 (uk) * 2005-08-24 2011-04-11 Квелкомм Инкорпорейтед Змінні інтервали часу передачі для системи радіозв'язку
RU2407179C2 (ru) * 2005-08-24 2010-12-20 Квэлкомм Инкорпорейтед Переменные интервалы времени передачи для системы радиосвязи
JP4703513B2 (ja) * 2006-08-22 2011-06-15 株式会社エヌ・ティ・ティ・ドコモ 移動通信システムで使用される無線基地局及び方法
JP6196758B2 (ja) * 2012-07-20 2017-09-13 株式会社Ｎｔｔドコモ 移動局
US11395292B2 (en) * 2015-11-06 2022-07-19 Motorola Mobility Llc Method and apparatus for low latency transmissions

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
HUAWEI ET AL: "PUSCH design for short TTI", vol. RAN WG1, no. Gothenburg, Sweden; 20160822 - 20160826, 21 August 2016 (2016-08-21), XP051125246, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN1/Docs/> [retrieved on 20160821] *
NOKIA ET AL: "Simultaneous Transmissions of UL Signals for Shortened TTI Operation", vol. RAN WG1, no. Gothenburg, Sweden; 20160822 - 20160826, 21 August 2016 (2016-08-21), XP051125670, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/Meetings_3GPP_SYNC/RAN1/Docs/> [retrieved on 20160821] *
NTT DOCOMO ET AL: "sPUSCH for shortened TTI", vol. RAN WG1, no. Gothenburg, Sweden; 20160822 - 20160826, 13 August 2016 (2016-08-13), XP051142556, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_86/Docs/> [retrieved on 20160813] *
PANASONIC: "UL simultaneous transmission between sTTI and TTI", vol. RAN WG1, no. Gothenburg, Sweden; 20160822 - 20160826, 12 August 2016 (2016-08-12), XP051141952, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_86/Docs/> [retrieved on 20160812] *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3570599A4 (fr) * 2017-01-12 2020-08-26 Ntt Docomo, Inc. Terminal utilisateur et procédé de communication radio
US11457419B2 (en) 2017-01-12 2022-09-27 Ntt Docomo, Inc. User terminal and radio communication method

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EP3520502A1 (fr) 2019-08-07
US20190230601A1 (en) 2019-07-25
RU2716500C1 (ru) 2020-03-12
CN109792692A (zh) 2019-05-21
EP3520502B1 (fr) 2021-11-03
US10785727B2 (en) 2020-09-22
CN109792692B (zh) 2022-02-08

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